diff --git a/Config.in b/Config.in
index 0002df5176..25f24b9d20 100644
--- a/Config.in
+++ b/Config.in
@@ -332,6 +332,9 @@ config BR2_CCACHE_DIR
 	default "$(HOME)/.buildroot-ccache"
 	help
 	  Where ccache should store cached files.
+	  If the Linux shell environment has defined the BR2_CCACHE_DIR
+	  environment variable, then this overrides this configuration
+	  item.
 
 config BR2_CCACHE_INITIAL_SETUP
 	string "Compiler cache initial setup"